Leachate Recirculation Effects on Settlement and Biodegradation Rates in MSW Landfills

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Abstract
Long term biodegradation of organic materials and associated settlement in municipal solid waste landfills hinder the reclamation of a landfill site and its conversion to other beneficial uses. The estimation of the extent of long term biodegradation and landfill settlements become an integral part towards final site closure and ultimate usage. The rate and magnitude of these settlements depend not only on the refuse decomposition but also on operational-management practices and factors affecting biodegradation processes within landfills particularly moisture content. Field scale experiments were conducted to evaluate biodegradation and associated refuse settlement rates with increased moisture content in the form of leachate recirculation. Biodegradation rates are evaluated as a function of methane gas generation rates which in turn are correlated with measured settlement rates.

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